I have just been called by a Hamamatsu representative from Sweden (Nordic Department).

They only sell these cameras to Companies and institutions (Universities, etc) and are not allowed to sell to private persons as of this moment.
The price of this camera (low cost version you linked in OP) is around 90.000 SEK ex.VAT, which translates to roughly €9800,- (or $11000,-).
So Yeah... right into FLI cameras territory. Expensive!

He said, they are mostly used in Biological Applications today, but that they are actually currrently in negiotiations with a University that wants to use this camera in an Astronomy Project.

Well, when I went up to the Photonics West show. I talked to Point Gray about what camera would be good for amateurs solar imaging. He said, new in the Blackfly GiGE cameras is the BFLY-PGE-2356C/M-C. It uses the Sony IMX249 chip and is similar to the Sony IMX174 but runs slower(30 frames/sec). They plan to add this camera chip to the USB 3 models soon at the same price range as the Blackfly. The Blackfly camera is in the $400-$500 range. The USB 3 , IMX174 camera is around $900.
Mark W.